fix(context-provider): fix the issue that failed to get branch splited by slash

[zwpaper]

[codecov]

Codecov Report

❌ Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.43%. Comparing base (b409924) to head (3673f14).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ee/tabby-webserver/src/service/repository/git.rs	0.00%	19 Missing ⚠️
...by-webserver/src/service/repository/third_party.rs	0.00%	10 Missing ⚠️
crates/tabby-git/src/lib.rs	0.00%	5 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4427      +/-   ##
==========================================
- Coverage   54.49%   54.43%   -0.06%     
==========================================
  Files         227      227              
  Lines       27043    27066      +23     
==========================================
- Hits        14736    14734       -2     
- Misses      12307    12332      +25     

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